static void Main(string[] args) { while (true) { Console.WriteLine("Select the action (the value):"); Console.WriteLine("1 - Add new employee"); Console.WriteLine("2 - Select all employees"); Console.WriteLine("3 - Select user by parametr from list (Max and Min salary, avarage age of employees )"); Console.WriteLine("4 - Select user by department"); Console.WriteLine("5 - Select user by name"); string SelectAction = Console.ReadLine(); switch (SelectAction) { case "1": Console.WriteLine("Add new employee"); PersonsList.Add(PersonAttribute.AddEmployees()); break; case "2": Console.WriteLine($"Employees list"); //Select "PersonsList" for itemize PersonAttribute.SelectAllEmployees(PersonsList); //Use "PersonAttribute" for itemize break; case "3": Console.WriteLine("Select one parametr from list: "); Console.WriteLine("Parametr 1 is max salary"); Console.WriteLine("Parametr 2 is min salary"); Console.WriteLine("Parametr 3 is average age of employees"); PersonAttribute.OptionList(PersonsList); break; case "4": PersonAttribute.SelectDepartment(PersonsList); break; case "5": PersonAttribute.SelectUserByName(PersonsList); break; } Console.WriteLine("For ending the program enter the 'end', for continuing press 'enter'"); string EndAction = Console.ReadLine(); if (EndAction == "end") { break; } } Console.WriteLine("The program is ended"); }